This README describes the replication files for Crabtree and Kern (2018). There are four files.

1. 'transmitters.csv' contains publicly available data on ORTM transmitters in Bamako. Data come from fmlist.org.
2. 'cloud_rf_output.tiff' contains a signal strength measure based on the transmitter characteristics in 'transmitters.csv' that could serve as the treatment variable in an observational study. Cloudrf.org was used to generate this output.
3. 'tilemill_map.tiff' maps the signal strength measure from 'cloud_rf_output.tiff'. The map was generated with TileMill, using the application's built-in state boundaries and place names.
4. 'walkthrough.mp4' contains a short video guide to constructing a signal strength measure using the Irregular Terrain Model (ITM).